====== How to create Gentoo system disks with RAID1 hard drive setup ======

Create partitions on both disks with same configuration.

<code>parted -a opt /dev/sda
mklabel gpt
mkpart primary xfs 1 2mb
mkpart primary xfs 2mb 2000mb
mkpart primary xfs 2000mb 12000mb
mkpart primary xfs 12000mb -1
name 1 grub
name 2 boot
name 3 swap
name 4 root
set 1 bios_grub on
set 2 raid on
set 3 raid on
set 4 raid on

parted /dev/sda set 1 bios_grub on
parted /dev/sdb set 1 bios_grub on
</code>

Now create raid:

<code>
mdadm --create --verbose /dev/md11 --level=1 --raid-devices=2 /dev/sda2 /dev/sdb2
mdadm --create --verbose /dev/md12 --level=1 --raid-devices=2 /dev/sda3 /dev/sdb3
mdadm --create --verbose /dev/md13 --level=1 --raid-devices=2 /dev/sda4 /dev/sdb4
</code>

<code>
mkswap /dev/md12 && swapon /dev/md12
mkfs.xfs /dev/md11
mkfs.xfs /dev/md13
</code>
##################################

====== Enter Installed System From Install Cd ======

1. Boot up with the Gentoo minimal cd.

2. Mount your gentoo partitions...

<code>mount /dev/sda3 /mnt/gentoo</code>
<code>mount /dev/sda1 /mnt/gentoo/boot</code>
<code>mount -t proc none /mnt/gentoo/proc</code>
<code>mount -o bind /dev /mnt/gentoo/dev</code>
<code>mount --rbind /sys /mnt/gentoo/sys</code>
<code>mount --rbind /dev /mnt/gentoo/dev</code>


3. chroot into the install gentoo environment...

<code>cd /mnt/gentoo</code>
<code>chroot /mnt/gentoo /bin/bash</code>
<code>env-update</code>
<code>source /etc/profile</code>


====== Add LVM and RAID support at boot time ======
genkernel is** Deprecated**  Use sys-kernel/installkernel instead.

<code>
<del>genkernel --lvm --mdadm --install initramfs</del>
</code>

===== Install GRUB =====


If need To install GRUB, need to enter installed Gentoo system: 
[[gentoo_env|Enter Installed System From Install Cd]]


and install GRUB2 on both physical disks with RAID support
<code>emerge — ask sys-boot/grub:2
emerge mdadm
grub-install /dev/sda
grub-install /dev/sdb
grub-mkconfig -o /boot/grub/grub.cfg
</code>


add RAID support at initial boot sequence
add <code>GRUB_CMDLINE_LINUX_DEFAULT="domdadm dolvm" to /etc/default/grub</code>
(Gento):
<code>
GRUB_CMDLINE_LINUX_DEFAULT="domdadm dolvm"
</code>

list HDD UUID’s
<code>blkid</code>

add HDD UUID’s to fstab file
<code>nano -w /etc/fstab
UUID=cce19bb0–9ec1–4417-b18d-69b9b9eb610a /boot xfs defaults,noatime 0 2
UUID=eb55e616–2951–42db-be28–880f66f1d185 none swap sw 0 0
UUID=748ec6a3-be66–4b5b-a73b-da5f066baaf4 / xfs noatime 0 1</code>

Source: [[https://medium.com/@ristic.sasa/how-to-install-gentoo-linux-with-raid1-hard-drive-setup-virtualbox-tested-208addd69a95|How to install Gentoo Linux with RAID1 hard drive setup (VirtualBox tested)]]

 Add records to mdadm.conf file:
<code>
mdadm --detail --scan >> /etc/mdadm/mdadm.conf
</code>